A) They are rich in humus
B) They are rich in mineral content
C) They are provided with intense irrigation
D) They are replenished by annual floods
Correct Answer: D
Solution :[d] Alluvial soils are formed by the depositional work of rivers in the river valleys, flood plains and deltas. The Sutlej-Ganga-plain has the largest deposition of alluvial soils. These are very fertile soils and this plain is considered to be one of the world's most fertile areas. This is due to the fact that these soils are replenished by annual floods.
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